Abstract
Gratings inscribed in polymer optical fibre (POF) have attracted remarkable interest for many potential applications due to their distinctive properties. This paper overviews the current state of fabrication of POF gratings since their first demonstration in 1999. In particular we summarize and discuss POF materials, POF photosensitivity, techniques and issues of fabricating POF gratings, as well as various types of POF gratings.
Highlights
With the continuing development of material and fabrication technologies over the last three decades, the transmission attenuation of polymer optical fibre (POF) has been greatly decreased
Poly(methyl methacrylate) (PMMA), polycarbonates (PC), polystyrene (PS), cyclic olefin copolymer (COC produced by TOPAS, Frankfurt, Germany) and amorphous fluoropolymer (CYTOP produced by Asahi Glass, Tokyo, Japan) are the most popular optical polymers used for the POF fabrication
COC is an amorphous transparent copolymer, which has already been used for the fabrication of POF for their attractive feature of low moisture absorption (0.01%) and good chemical resistance though its Tg is lower than the typical PMMA [31,51,52,53,54]
Summary
With the continuing development of material and fabrication technologies over the last three decades, the transmission attenuation of POFs has been greatly decreased. In general POF has several distinctive advantages over silica fibre for sensing applications [14]. Reviews specific on POF sensors have been presented by Peters [16], Bilro [17], and Granville [18]. POFs end faces with high quality and the increase of quality in the production of FBGs have been summarized by Bilro [29] These previous reviews regarding POF gratings are mainly focused on the properties of POF gratings as well as their sensing applications. It will be useful to summarize the work conducted on POF gratings during the last 18 years The review of their fabrication will be appreciated by the community and is a good starting point for researchers who are new to the field.
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